Manufacture of wood pulp for paper



UNITED STATES PATENT OFFICE.

MANUFACTURE OF WOOD PULP FOR PAPER.

SPECIFICATION formingpart of Letters Patent No. 233,070, dated October 12, 18 80.

- Application filed February 4, 1880.

facture of useful articles is concerned.

My invention consists in the utilization and reduction to pulp of the tops of trees, bushes, Ste-that is, the twigs and small branches or brush-which are 110w considered of no value, but are got rid of by burning.

Heretofore wood or wood-fiber has been reduced to pulp substantially in three ways: first, by grinding from the side of the grain by abrasion against the surface of a rotary stone; second, by disintegrating or separating the fibers by percussion; and, third, by separating and softening the fiber by a chemical bath or vapor.

It is not practicable to reduce the twigs and small branches of trees or bushes to pulp by any of the above methods, since they do not possess bulk and strength enough for the grinding process on the periphery of a revolving stone, while the bark in which they are entirely inclosed prohibits their being reduced by the percussive or chemical processes.

My present invention is in furtherance of a system of producing wood pulp begun in my Patent No. 182,891, and dated the 3d day of October, 1876, in which is shown an engine composed of two stones, arranged face to face, and between which the wood is reduced to pulp, water being introduced to prevent clogging of the stones and provide the necessary vehicle for the finished pulp.

In carrying my invention into practice in the manufacture of pulp, I collect large quantities of brush, so called, and before introducing into the engine, in which water is employed, I prefer to pass it through preliminary crushing-rollers, by which comminution is, to a considerable degree, effected, and wear of the stones in the engine economized, after which it is introduced to the engine and reduced to pulp, as explained in my patent before named.

A pulp composed of the wood and bark of brush or twigs, as before stated, is sufficiently strong for and is to be applied to the manufacture of hollow articles, such as kegs, pails, barrels, &c., as well as for chair-seats and various other articles.

I claim 1. A wood pulp produced by reduction between revolving stones of brush, twigs, and small branches of trees in their natural state, substantially as explained.

22. The process of producing wood pulp from twigs, brush, and small branches of trees by first crushing and subsequently grinding, substantially as hereinbefore set forth.

JEFFERSON CHASE.

Witnesses:

H. E. LODGE, M. BAILEY. 

